#include <stdio.h>
void Feb_days(){
	int year;
	scanf("%d",&year);
	if( (year % 4 == 0) && (year % 100 != 0)){
		printf("days:29");
	}else{
		printf("days:28");
	}
}
int main()
{
	Feb_days();
	return 0;
 } 
